Note 8 - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

	Estimated Fair Value		Level 1		Level 2		Level 3
Assets:
Money market account	$	1,789,401	$	1,789,401	$	-	$	-
Liabilities:
Common stock warrant liability	$	13,003,075	$	-	$	-	$	13,003,075

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Warrant Liability
Beginning balance	$	-
Issuance of warrants		10,670,508
Change in fair value		2,332,567
Ending balance	$	13,003,075